In a large bowl, combine the flour, brown sugar, baking powder, pumpkin pie spice, salt and baking soda.,Cut in butter until mixture resembles coarse crumbs.,In a small bowl, whisk the egg, sweet potatoes and buttermilk; add to dry ingredients just until moistened.,______,Pat into an 8-in. circle.,Cut into eight wedges.,Separate wedges and place 1 in apart on a baking sheet lightly coated with nonstick cooking spray.,Bake at 400° for 16-21 minutes or until golden brown.,Cool on a wire rack for 5 minutes. Serve warm.